Sorry to hear you are experiencing a problem with your Kenmore refrigerator. Sears is still the most trusted name in home appliances and we still provide service on all the products we sell, using our own service department.
Intermittent noise from the freezer fan can be caused due to frost or ice buildup. This most often happens if the freezer door is left ajar and this sound like what you are experiencing especially if it is intermittent. This is not uncommon with the freezer door below eye sight on the French model.
I suggest the next time it makes this noise, check the back panel in the freezer to see if there is frost or ice buildup around fan shroud.
The compressors on these units are sensitive to movement and if they are subjected to movement there can be a rattling sound that last a few minutes.( level and secure is required)
I hope these tips help, of course there can always be other factors causing the issues you described that may require a service technician come to your home and diagnose the problems. Should you need additional assistance from myself reply with more details and I will be happy to respond.
Thanks Ron H.
If you get to the point where you need to have a service technician diagnose and repair this failure, you can schedule service through this link:
Sears Home Services